Question

why 221 and 391 cannot be prime

Answer 1

Answer:

Here's ur answer mate......

Step-by-step explanation:

For 221 to be a prime number,

it would have been required that 221 has only two divisors.

i.e., itself and 1.

However, 221 is a semiprime (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers.

Indeed, 221 = 13 x 17, where 13 and 17 are both prime numbers.

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